GitHub Actions Setup for Templated Repository

[harryswift01]

Summary

This PR sets up GitHub Actions for the template Python repository. The CI workflow serves two main purposes:

1. Acts as a reference for creating GitHub Actions for Python projects.
2. Ensures the repository’s long-term sustainability by automatically running tests, building documentation, and checking code style.

Changes

• Added a CI workflow for testing, documentation, and pre-commit checks.
• Configured multi-platform testing across Linux, Windows, and macOS.
• Configured Python version matrix to test multiple Python versions.
• Added coverage reporting with Coveralls.
• Set up pre-commit hooks for code quality.

Impact

• Ensures new changes pass tests before merging.
• Maintains consistent code style and documentation quality.
• Supports cross-platform Python development and future updates.